# CVE-2018-18370: Cross-site scripting in Symantec Advanced Secure Gateway (ASG)

> Remote attackers can inject malicious JavaScript via crafted FTP files in WebFTP mode, requiring FTP upload access to exploit.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 Aug 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-m2px-9cv3-x8qj

## What is CVE-2018-18370?

CVE-2018-18370 is a medium-severity cross-site scripting vulnerability in Symantec Advanced Secure Gateway (ASG), published on 29 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The ASG/ProxySG FTP proxy WebFTP mode allows intercepting FTP connections where a user accesses an FTP server via a ftp:// URL in a web browser. A stored cross-site scripting (XSS) vulnerability in the WebFTP mode allows a remote attacker to inject malicious JavaScript code in ASG/ProxySG's web listing of a remote FTP server. Exploiting the vulnerability requires the attacker to be able to upload crafted files to the remote FTP server. Affected versions: ASG 6.6 and 6.7 prior to 6.7.4.2; ProxySG 6.5 prior to 6.5.10.15, 6.6, and 6.7 prior to 6.7.4.2.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2018-18370?

It affects 2 products.


Products: Broadcom Advanced Secure Gateway, Broadcom Symantec Proxysg.

## How do I fix CVE-2018-18370?

No fix has been published for CVE-2018-18370 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-18370 being exploited?

There is no known exploitation of CVE-2018-18370 in the wild and no public exploit code.

## Other vulnerabilities in Symantec Advanced Secure Gateway (ASG)

- [CVE-2023-23952](https://insights.sbomify.com/CVE-2023-23952/): Command injection in Advanced Secure Gateway, Content Analysis (critical 9.8)
- [CVE-2018-5241](https://insights.sbomify.com/CVE-2018-5241/): Auth bypass in Advanced Secure Gateway (ASG) (critical 9.8)
- [CVE-2021-46825](https://insights.sbomify.com/CVE-2021-46825/): Other in Advance Secure Gateway and ProxySG (critical 9.1)
- [CVE-2023-23955](https://insights.sbomify.com/CVE-2023-23955/): Server-side request forgery in Advanced Secure Gateway, Content Analysis (high 8.1)
- [CVE-2023-23953](https://insights.sbomify.com/CVE-2023-23953/): Privilege escalation in Advanced Secure Gateway, Content Analysis (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-18370 and fix it if it is affected.

What it is: CVE-2018-18370 is a medium-severity cross-site scripting vulnerability in Symantec Advanced Secure Gateway (ASG), published on 29 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-18370 in the wild and no public exploit code.

Affected product: Symantec Advanced Secure Gateway (ASG). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-18370/ (Markdown: https://insights.sbomify.com/CVE-2018-18370/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18370
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18370
- OSV: https://osv.dev/vulnerability/CVE-2018-18370

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18370/
Summaries are generated and may contain mistakes; the official description above is the record.